Problems for seeing Multypolygons with OSMGeoAdmin

Hi everubody, recently I've been reading the documentation about Geodjango and following the tutorial. The problem or maybe daoubt came when I change the GeoModelAdmin that at first is used for seeing the world borders in that example, but when I changed it to GeoModelAdmin I cannot see the borders, I hope you can help me to fix that, what's wrong?

Thanks in advance, Marcus.

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